Chapter 11: Micronutrients in Metabolism

11.7 Folate (Vitamin B9)

University of Hawai‘i at Mānoa Food Science and Human Nutrition Program

Folate

Folate is a required coenzyme for the synthesis of the amino acid methionine, and for making RNA and DNA. Therefore, rapidly dividing cells are most affected by folate deficiency. Red blood cells, white blood cells, and platelets are continuously being synthesized in the bone marrow from dividing stem cells. When folate is deficient, cells cannot divide normally A consequence of folate deficiency is macrocytic or megaloblastic anemia. Macrocytic and megaloblastic mean “big cell,” and anemia refers to fewer red blood cells or red blood cells containing less hemoglobin. Macrocytic anemia is characterized by larger and fewer red blood cells. It is caused by red blood cells being unable to produce DNA and RNA fast enough—cells grow but do not divide, making them large in size. (Figure 11.71 “Folate and the Formation of Macrocytic Anemia”)

Folate and the Formation of Macrocytic Anemia
Figure 11.71 Folate and the Formation of Macrocytic Anemia. Image by Allison Calabrese / CC BY 4.0

Folate is especially essential for the growth and specialization of cells of the central nervous system. Children whose mothers were folate-deficient during pregnancy have a higher risk of neural-tube birth defects. Folate deficiency is causally linked to the development of spina bifida, a neural-tube defect that occurs when the spine does not completely enclose the spinal cord. Spina bifida can lead to many physical and mental disabilities (Figure 11.72 “Spina Bifida in Infants” ). Observational studies show that the prevalence of neural-tube defects was decreased after the fortification of enriched cereal grain products with folate in 1996 in the United States (and 1998 in Canada) compared to before grain products were fortified with folate.

Additionally, results of clinical trials have demonstrated that neural-tube defects are significantly decreased in the offspring of mothers who began taking folate supplements one month prior to becoming pregnant and throughout the pregnancy. In response to the scientific evidence, the Food and Nutrition Board of the Institute of Medicine (IOM) raised the RDA for folate to 600 micrograms per day for pregnant women. Some were concerned that higher folate intakes may cause colon cancer, however scientific studies refute this hypothesis.

Spina Bifida in an infant
Figure 11.72 Spina Bifida in Infants. Spina bifida is a neural-tube defect that can have severe health consequences.

Dietary Reference Intakes

The RDAs and ULs for different age groups for folate are listed in Table 11.71 “Dietary Reference Intakes for Folate”. Folate is a compound that is found naturally in foods. Folic acid however is the chemical structure form that is used in dietary supplements as well as enriched foods such as grains. The FNB has developed dietary folate equivalents (DFE) to reflect the fact that folic acid is more bioavailable and easily absorbed than folate found in food. The conversions for the different forms are listed below.

1 mcg DFE = 1 mcg food folate

1mcg DFE = 0.6 mcg folic acid from fortified foods or dietary supplements consumed with foods

1 mcg DFE = 0.5 mcg folic acid from dietary supplements taken on an empty stomach

Table 11.71 Dietary Reference Intakes for Folate[1]

Age Group RDA Males and Females mcg DFE/day UL
Infants (0–6 months) 65* Not possible to determine
Infants (7–12 months) 80* Not possible to determine
Children (1–3 years) 150 300
Children (4–8 years) 200 400
Children (9–13 years) 300 600
Adolescents (14–18 years) 400 800
Adults (> 19 years) 400 1000
Pregnancy 600 Same as non-pregnant
Lactation 500 Same as non-lactating
*denotes Adequate Intake

Dietary Sources

Folate is found naturally in a wide variety of food especially in dark leafy vegetables, fruits, and animal products. The U.S. Food and Drug Administration (FDA) began requiring manufacturers to fortify enriched breads, cereals, flours, and cornmeal to increase the consumption of folate in the American diet. For the folate content of various foods, see Table 11.72 “Folate Content of Various Foods”.

Table 11.72 Folate Content of Various Foods[2]

Food Serving Folate (mcg DFE) Percent Daily Value
Beef Liver 3 oz. 215 54
Fortified breakfast cereals ¾ c. 400 100
Spinach ½ c. 131 33
White rice, enriched ½ c. 90 23
Asparagus 4 spears 85 20
White bread, enriched 1 slice 43 11
Broccoli 2 spears 45 10
Avocado ½ c. 59 15
Orange juice 6 oz. 35 9
Egg 1 large 22 6

 


  1. Dietary Supplement Fact Sheet: Folate. National Institute of Health, Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Folate-HealthProfessional/. Updated November 30, 2022. Accessed August 2, 2023.
  2. Ibid.
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